TM 55-1510-220-MTF
8.
Left bleed air valve switch - OPEN.
9.
Right bleed air valve switch - ENVIRO OFF.
10. Slowly retard the left power lever and record the minimum NI speed that the left engine must be
operated at to maintain the cabin pressure differential at 6.0.1. N1 should not exceed 85%, and the
minimum desirable N1 is 80%.
11. Right bleed air valve switch - OPEN.
12. Cabin altitude controller - Set to 10,000 feet pressure altitude.
13. Cabin pressurization rate knob - Set to maximum.
14. Cabin rate of climb indicator - Read and record. Cabin rate of descent should be between 1500 and
2500 feet per minute.
15. Cabin pressurization rate knob - Set to mid- range.
16. Cabin rate of climb indicator - Read and record cabin rate of descent. Cabin rate of descent should be
between 350 and 650 feet per minute.
17. Cabin pressurization rate knob - Set to minimum.
18. Cabin rate of climb indicator - Read and record cabin rate of descent. Cabin rate of descent should be
between 50 and 300 feet per minute.
19. Cabin altitude controller - Set.
20. Cabin rate of climb indicator - Read and record cabin rate of descent. Cabinrate of descent should be
between 50 and 350 feet per minute.
21. Cabin pressurization rate knob - Set to maximum.
22. Cabin rate of climb indicator - Read and record cabin rate of descent. Cabin rate of descent should be
between 1500 and 2500 feet per minute.
23. Cabin pressurization rate knob - Set to midrange.
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